/*
 * Copyright � 2002-2011 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

using System.Web;
using Spring.Context;
using Spring.Context.Support;
using Spring.Util;

namespace Spring.Web.Support;
#if !MONO
/// <summary>
/// SimpleHandlerFactory is used to wrap any arbitrary <see cref="IHttpHandlerFactory"/> to make it "Spring-aware".
/// </summary>
/// <remarks>
/// By default, an instance of <see cref="System.Web.UI.SimpleHandlerFactory"/> is used as underlying factory.
/// </remarks>
/// <author>Erich Eichinger</author>
#endif
public class DefaultHandlerFactory : AbstractHandlerFactory
{
    private readonly IHttpHandlerFactory _innerFactory;
#if !MONO
    /// <summary>
    /// Creates a new instance, using a <see cref="System.Web.UI.SimpleHandlerFactory"/> as underlying factory.
    /// </summary>
#else
        /// <summary>
        /// Creates a new instance of the DefaultHandlerFactory
        /// </summary>
#endif
    public DefaultHandlerFactory()
        : this(SimpleHandlerFactory)
    {
    }

    /// <summary>
    /// Create a new instance, using an instance of <paramref name="innerFactoryType"/> as underlying factory.
    /// </summary>
    /// <param name="innerFactoryType">a type that implements <see cref="IHttpHandlerFactory"/></param>
    public DefaultHandlerFactory(Type innerFactoryType)
        : this((IHttpHandlerFactory) Activator.CreateInstance(innerFactoryType, true))
    {
    }

    /// <summary>
    /// Create a new instance, using <paramref name="innerFactory"/> as underlying factory.
    /// </summary>
    /// <param name="innerFactory">the factory to be wrapped.</param>
    public DefaultHandlerFactory(IHttpHandlerFactory innerFactory)
    {
        AssertUtils.ArgumentNotNull(innerFactory, "innerFactory");
        _innerFactory = innerFactory;
    }

    /// <summary>
    /// Create a handler instance for the given URL.
    /// </summary>
    /// <param name="appContext">the application context corresponding to the current request</param>
    /// <param name="context">The <see cref="HttpContext"/> instance for this request.</param>
    /// <param name="requestType">The HTTP data transfer method (GET, POST, ...)</param>
    /// <param name="rawUrl">The requested <see cref="HttpRequest.RawUrl"/>.</param>
    /// <param name="physicalPath">The physical path of the requested resource.</param>
    /// <returns>A handler instance for processing the current request.</returns>
    protected override IHttpHandler CreateHandlerInstance(IConfigurableApplicationContext appContext, HttpContext context, string requestType, string rawUrl, string physicalPath)
    {
        IHttpHandler handler = _innerFactory.GetHandler(context, requestType, rawUrl, physicalPath);

        // find a matching object definition
        string appRelativeVirtualPath = WebUtils.GetAppRelativePath(rawUrl);
        NamedObjectDefinition nod = FindWebObjectDefinition(appRelativeVirtualPath, appContext.ObjectFactory);
        string objectDefinitionName = (nod != null) ? nod.Name : rawUrl;

        handler = WebSupportModule.ConfigureHandler(context, handler, appContext, objectDefinitionName, (nod != null));
        return handler;
    }

    /// <summary>
    /// Enables a factory to release an existing
    /// <see cref="System.Web.IHttpHandler"/> instance.
    /// </summary>
    /// <param name="handler">
    /// The <see cref="System.Web.IHttpHandler"/> object to release.
    /// </param>
    public override void ReleaseHandler(IHttpHandler handler)
    {
        _innerFactory.ReleaseHandler(handler);
    }
}
